<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var arr = [10,100,1000];
    
        function map(arr) {
            var arr1 = []
            for (var i = 0; i < arr.length; i++) {
                arr1[i] = arr[i] * 1.3
            }
            return arr1
            }
 
        map(arr)
        console.log(map(arr));
                
    </script>
</body>
</html>